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Thread: TD5 Head Gasket

  1. 8th October 2013, 09:57 PM #1
    djam1's Avatar
    djam1
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    TD5 Head Gasket

    Just putting this one out there it may help people in the future.

    A couple of weeks back I left to go on holidays Monday I started my journey back up North to discover that the TD5 Defender was pushing coolant out of the cap.
    Not a problem I thought it only had a new AMC head installed with steel dowels 25000 Ks ago must be the cap.
    Put a new cap on and drove 160 Ks to discover the issue still existed.

    Put car in to have head removed to see whats going on to discover that the Head Gasket has failed in multiple places.
    A well known WA Land Rover expert indicates he has seen this when aftermarket head bolts are used apparently they loose tension and the mayhem begins.
    The workshop involved both now and 25000 Ks ago indicate they only use genuine bolts

    The car does have a VNT and has an excellent tune by Jose on my way south the maximum EGT was 620 degrees (140 Km/h passing a truck) the norm seemed to be 380-450 degrees
    Not sure if any of the changes have caused the issue
    Max turbo pressure is probably 24 PSI with the bulk of the long journey sitting on 18 PSI.

    Not sure what the lesson is yet but I suspect the use of aftermarket head bolts on a TD5 are a bad idea.
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  2. 8th October 2013, 10:14 PM #2
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    Defender Mike
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    Bolts stretch

    Did you have them retightend after a few thousand ks. They are very long bolts and stretch.
    Mike
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  3. 8th October 2013, 10:16 PM #3
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    Slunnie
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    Quote Originally Posted by Defender Mike View Post
    Did you have them retightend after a few thousand ks. They are very long bolts and stretch.
    Mike
    They don't do that with new cars do they?
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
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  4. 8th October 2013, 10:16 PM #4
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    As this is not the correct procedure no
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  5. 9th October 2013, 08:26 AM #5
    llandro
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    My thinking about those very long head retaining bolts on the td5 is that they twist when being tightened. It would not be difficult to introduce a 45-90* twist which would relax when expanded/contracted a few times.
    That the original plastic locating dowels fret must indicate that the head shuffles about when it should be clamped tight.
    Just a thought from an old bloke who used to muck about with old motor bike engines with head to crankcase through bolts which rquired constant tightening when high CR's and racing fuel was the go!
    mike
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  6. 9th October 2013, 10:25 AM #6
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    Disco Muppet
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    I seem to recall reading similar stories.
    Genuine head bolts is on my list, as I'm probably going to do the head gasket early next year.
    Keep us posted on any updates
    The Phantom - Oslo Blue 2001 Td5 SE.
    Half dead but will live again!

    Nina - Chawton White 2003 Td5 S
    Slowly being improved

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    You worry me sometimes Muppet!!

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  7. 9th October 2013, 09:14 PM #7
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    Got the car back today and drove 160 Ks north runs beautifully interestingly the EGTs seem lower and the car runs much smoother.

    I have the old bolts and gasket that I will try to get some expert opinions on.
    The head gasket has splits on 1 layer of laminate between the 3 rear cylinders .
    Lots of cracks in the gasket the mechanic that did the job says hes never seen one like it??

    It amazes me how well it was running in the state that it was in.
    Anyone got any ideas who could give an opinion? I can send the bolts to whoever I need to.
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  8. 11th October 2013, 03:31 PM #8
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    For those interested general condition of gasket

    Similar scenario
    http://www.aulro.com/afvb/discovery-...ket-again.html
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  9. 11th October 2013, 04:06 PM #9
    uninformed
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    Djam, are the mob that did the inital head gasket saying they definitely used genuine head bolts on your vehicle? IF so, what are they saying caused the failure?
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  10. 11th October 2013, 04:11 PM #10
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    djam1
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    Not saying anything much to be honest
    I don't hold them responsible and have copped it as bad luck at 2 years and 25000 Ks no real recourse as I see it.
    I would like to determine why so I can prevent it from happening again
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